Hi guys ! I'm often unable to check if my mortises wall are straight because all my squares are too big to fit it in the hole, even my smallest 4" square. Am I missing something or is there a tool made for that ? I most often use my chisel blade but it doesn't tell me if my mortise is perpendicular to the surface...

Woodnthings suggestion is good. Another option is to make yourself another long square from stable hardwoods and cut off an end to fit into your mortise. I struggled with your delima until I started cutting my mortises with routers... They hold the bit at 90* and a 1/4 or 3/8 bit are exactly the size you choose. My MT joints are now always very near too perfection. I assemble them by hand (no mallet etc. needed) and take them apart by hand, yet the hold when I pick them during dry fit. I can elaborate further if you have any questions.

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